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DynamoDB at HasOffers
• Attribution for web & mobile marketing 
• Tons of data 
• Ad-hoc analysis 
• Near real-time
DynamoDB at HasOffers 
18 months in production 
207 billion items 
87 TB of data
Use Cases 
Tracking sessions 
Deduplication 
Attribution
Tracking 
Sessions
Use Case: Tracking Sessions 
Session 
Data 
671c6a9a-bed0-4cec-a465-613cca8c9832 
• Impression 
• Click
Use Case: Tracking Sessions 
• Ideal for NoSQL 
• KV lookups 
• Scalability 
• Availability
Deduplication
Use Case: Event Deduplication 
671c6a9a-bed0-4cec-a465-613cca8c9832 
ebe0efef-aa71-471c-b3f8-7b66b458bd79 
ebe0efef-aa71-471c-b3f8-7b66b458bd79 
d149e52c-d2b3-49bc-b6af-f304b5fab57f 
DEDUPE! 
(Idempotency)
Use Case: Event Deduplication 
Hash uuid 
Range <none> 
Write capacity = X, Read capacity = 1 
Conditional puts
Use Case: Event Deduplication 
def is_duplicate( dynamo_tbl, uuid ): 
row_data = {‘host’: socket.gethostname(), 
‘created’: int(time.time())} 
row = dynamo_tbl.new_item( hash_key=uuid, attrs=row_data ) 
DEDUPE! 
try: 
row.put( expected_value={‘host’: False} ) 
except DynamoDBConditionalCheckFailedError: 
return True 
# not a duplicate 
return False
Use Case: Event Deduplication 
• Real-time dedupe 
• Conditional put 
• Writes only; no read 
• Extra debug info 
{uuid: d149e52c-d2b3-49bc-b6af-f304b5fab57f, 
host: server03.hasoffers.com, 
created: 1398884990} 
DEDUPE!
Why NoSQL 
SaaS?
Cluster Resizing 
• Upsize and downsize trivial in DynamoDB 
• Infrequent on own cluster = limits operational experience
Cluster Software Updates 
0.7 1.0 
• Production depends on NoSQL solution 
being available. 
• Software version updates somewhere 
between nail-biting and terrifying
Dynamo 
Operations
DynamoDB Capacity 
Per table R/W capacity 
Capacity units 
Exceed = throttling
DynamoDB Throttling 
CloudWatch = 5 minutes 
DynamoDB = 1 second
DynamoDB Throttling 
• Double capacity on table 
• Root cause from log analysis 
– capacity usage 
– key hot-spotting 
• Fix root cause 
• Reduce capacity on table
Closing 
Thoughts
Closing Thoughts 
• Compelling offering 
• Simple operations 
• Avoid hammer syndrome 
• Very happy
Thank you! 
niek@hasoffers.com

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DynamoDB at HasOffers

  • 2. • Attribution for web & mobile marketing • Tons of data • Ad-hoc analysis • Near real-time
  • 3. DynamoDB at HasOffers 18 months in production 207 billion items 87 TB of data
  • 4. Use Cases Tracking sessions Deduplication Attribution
  • 6. Use Case: Tracking Sessions Session Data 671c6a9a-bed0-4cec-a465-613cca8c9832 • Impression • Click
  • 7. Use Case: Tracking Sessions • Ideal for NoSQL • KV lookups • Scalability • Availability
  • 9. Use Case: Event Deduplication 671c6a9a-bed0-4cec-a465-613cca8c9832 ebe0efef-aa71-471c-b3f8-7b66b458bd79 ebe0efef-aa71-471c-b3f8-7b66b458bd79 d149e52c-d2b3-49bc-b6af-f304b5fab57f DEDUPE! (Idempotency)
  • 10. Use Case: Event Deduplication Hash uuid Range <none> Write capacity = X, Read capacity = 1 Conditional puts
  • 11. Use Case: Event Deduplication def is_duplicate( dynamo_tbl, uuid ): row_data = {‘host’: socket.gethostname(), ‘created’: int(time.time())} row = dynamo_tbl.new_item( hash_key=uuid, attrs=row_data ) DEDUPE! try: row.put( expected_value={‘host’: False} ) except DynamoDBConditionalCheckFailedError: return True # not a duplicate return False
  • 12. Use Case: Event Deduplication • Real-time dedupe • Conditional put • Writes only; no read • Extra debug info {uuid: d149e52c-d2b3-49bc-b6af-f304b5fab57f, host: server03.hasoffers.com, created: 1398884990} DEDUPE!
  • 14. Cluster Resizing • Upsize and downsize trivial in DynamoDB • Infrequent on own cluster = limits operational experience
  • 15. Cluster Software Updates 0.7 1.0 • Production depends on NoSQL solution being available. • Software version updates somewhere between nail-biting and terrifying
  • 17. DynamoDB Capacity Per table R/W capacity Capacity units Exceed = throttling
  • 18. DynamoDB Throttling CloudWatch = 5 minutes DynamoDB = 1 second
  • 19. DynamoDB Throttling • Double capacity on table • Root cause from log analysis – capacity usage – key hot-spotting • Fix root cause • Reduce capacity on table
  • 21. Closing Thoughts • Compelling offering • Simple operations • Avoid hammer syndrome • Very happy